S: (n) act, routine, number, turn, bit (a short performance that is part of a longer program) "he did his act three times every evening"; "she had a catchy little routine"; "it was one of the best numbers he ever did"

S: (n) act (a manifestation of insincerity) "he put on quite an act for her benefit"

Verb

S: (v) act, move (perform an action, or work out or perform (an action)) "think before you act"; "We must move quickly"; "The governor should act on the new energy bill"; "The nanny acted quickly by grabbing the toddler and covering him with a wet towel"

S: (v) act, behave, do (behave in a certain manner; show a certain behavior; conduct or comport oneself) "You should act like an adult"; "Don't behave like a fool"; "What makes her do this way?"; "The dog acts ferocious, but he is really afraid of people"

S: (v) act, play, represent (play a role or part) "Gielgud played Hamlet"; "She wants to act Lady Macbeth, but she is too young for the role"; "She played the servant to her husband's master"

S: (v) work, act (have an effect or outcome; often the one desired or expected) "The voting process doesn't work as well as people thought"; "How does your idea work in practice?"; "This method doesn't work"; "The breaks of my new car act quickly"; "The medicine works only if you take it with a lot of water"

S: (v) act (be engaged in an activity, often for no particular purpose other than pleasure)

S: (v) act, behave, do (behave in a certain manner; show a certain behavior; conduct or comport oneself) "You should act like an adult"; "Don't behave like a fool"; "What makes her do this way?"; "The dog acts ferocious, but he is really afraid of people"